The airline industry wants to better accommodate passengers whose flights are delayed by providing more amenities. Which measure provides the best information to the airline industry?

A.
average length of delays per airline
B.
average length of delays per year
C.
average length of delays per airport
D.
average length of delays per year per passenger

C. average length of delays per airport. This measure would provide information on which airports have the most delays and therefore where the airline industry may want to focus their efforts in providing more amenities for delayed passengers.